v0.19.0

Added

• Human-readable report formats, independent of GitHub/ADO. draugr scan --format selects
  the stdout format: console (a grouped summary — verdict, P1–P4 counts, "fix first"),
  markdown (portable for GitLab/Bitbucket MR comments, wikis, Slack), plus json and
  sarif. Built on a new pluggable Reporter interface (first slice of #58).

Changed

• draugr scan now prints the console summary by default instead of raw JSON — the common
  interactive/CI-log case is now readable at a glance. Use --format json (or --output for
  report.json + results.sarif) for machine consumption. --output is unchanged.